deadbolt without screw

just moved and need to change the locks. But found the deadbolts from ex-owner really fancy. one with one screw and another got nothing, just like two blinded holes... even Homedepot staff got no idea how to dismantle that. pls help...thx!

Ray is on the money. The decorative cap has been pushed in too far. Aside, be aware that double cylinder deadbolts for primary entry doors (main front door and main back door) are illegal in most jurisdictions. Sometimes, just to get a residency permit may require that a single cylinder deadbolt be installed there. People tend to think that a double cylinder lock is more secure than just a single cylinder. The only advantage is where there is a glass window in or near the lock in question and you want to prevent the lock being operated if the glass is smashed.
You can use quality single cylinder deadbolts and install ShatterGard window film or similar to prevent window breakage. Then you comply with ADA, the local fire marshal, the local building inspector and save yourself from the potential of your insurance company refusing to pay a claim because you didnt abide by the codes.

The "decoratice caps" referenced, are the 2 small covers that conceal the heads of the screws in the face of the inside (not outside) cylinder. If you can't pry them out with a tiny screwdriver, and don't mind destroying them, use an ice pick to punch thru them right in the middle so you can then pry them out. The metal of the caps is very thin.

you right,the cap is indeed not that strong. Finally took it off but no clue how to move the real "dead bolt" with no head or thread.Used almost all tools except my teeth but it appears to be deadend...gave and already called locksmith. thanks anyway...

Answer is revealed!
Have to say the locksmith is really professional! He cracked the cap a little bit and used a tweezers to pull out the small "push pin"- this is the real trick! Then you will see the lovely bolt head is waiting there to be unscrewed... It took me 2 nights but he used less than 15mins in changing all 3 locks. Hope this could be helpful anyhow for someone still confusing about the same lock.

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